// Package handler 存放全部 HTTP 接口处理函数
package handler

import (
	"strings"

	"github.com/gin-gonic/gin"
	"golang.org/x/crypto/bcrypt"

	"nl-game-api-gin/internal/database"
	"nl-game-api-gin/internal/model"
	"nl-game-api-gin/internal/service"
	"nl-game-api-gin/pkg/jwtutil"
	"nl-game-api-gin/pkg/resp"
)

// registerReq 注册请求体
type registerReq struct {
	Username string `json:"username" binding:"required,min=3,max=20"` // 用户名：3-20位
	Password string `json:"password" binding:"required,min=6,max=32"` // 密码：6-32位
	Nickname string `json:"nickname" binding:"max=20"`                // 昵称：可选，默认同用户名
	Avatar   string `json:"avatar"`                                   // 头像：像素编码 px:01~px:32（旧 emoji 兼容）
}

// Register 用户注册：校验重名、加密密码、发注册礼积分
func Register(c *gin.Context) {
	var req registerReq
	if err := c.ShouldBindJSON(&req); err != nil {
		resp.Fail(c, "参数有误：用户名3-20位、密码6-32位")
		return
	}
	req.Username = strings.TrimSpace(req.Username)
	// 用户名查重
	var count int64
	database.DB.Model(&model.User{}).Where("username = ?", req.Username).Count(&count)
	if count > 0 {
		resp.Fail(c, "用户名已被占用")
		return
	}
	// bcrypt 加密密码
	hash, err := bcrypt.GenerateFromPassword([]byte(req.Password), bcrypt.DefaultCost)
	if err != nil {
		resp.Fail(c, "密码加密失败")
		return
	}
	if req.Nickname == "" {
		req.Nickname = req.Username
	}
	if req.Avatar == "" {
		req.Avatar = "px:01"
	}
	user := model.User{
		Username: req.Username, Password: string(hash),
		Nickname: req.Nickname, Avatar: req.Avatar, Role: model.RoleNormal,
	}
	if err := database.DB.Create(&user).Error; err != nil {
		resp.Fail(c, "注册失败，请稍后重试")
		return
	}
	// 注册礼积分（金额可在后台配置）
	gift := service.GetConfigInt(model.ConfKeyRegisterGift, 200)
	if gift > 0 {
		service.ChangePoints(nil, user.ID, gift, model.PointTypeRegister, 0, "新用户注册礼")
		user.Points = gift
	}
	token, _ := jwtutil.Generate(user.ID, user.Role)
	resp.OK(c, gin.H{"token": token, "user": user})
}

// loginReq 登录请求体
type loginReq struct {
	Username string `json:"username" binding:"required"` // 用户名
	Password string `json:"password" binding:"required"` // 密码
}

// Login 用户登录：校验密码、记录登录日志、签发 Token
func Login(c *gin.Context) {
	var req loginReq
	if err := c.ShouldBindJSON(&req); err != nil {
		resp.Fail(c, "请输入用户名和密码")
		return
	}
	var user model.User
	if err := database.DB.Where("username = ?", strings.TrimSpace(req.Username)).First(&user).Error; err != nil {
		resp.Fail(c, "用户名或密码错误")
		return
	}
	// bcrypt 校验密码
	if bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(req.Password)) != nil {
		resp.Fail(c, "用户名或密码错误")
		return
	}
	if user.Status == model.UserStatusBanned {
		resp.Fail(c, "账号已被封禁，请联系管理员")
		return
	}
	// 写登录日志（IP + 浏览器UA）
	database.DB.Create(&model.LoginLog{
		UserID: user.ID, IP: c.ClientIP(), UserAgent: c.GetHeader("User-Agent"),
	})
	token, err := jwtutil.Generate(user.ID, user.Role)
	if err != nil {
		resp.Fail(c, "登录凭证生成失败")
		return
	}
	resp.OK(c, gin.H{"token": token, "user": user})
}